FEAT: Update Simphony-Remote repo with latest development (2.2.0.dev)

[flongford]

This PR updates the repository with developments from the Simphony-3 group.

New features:

• Inclusion of (optional) license key in ApplicationPolicy object
• Inclusion of Nginx template scripts for setting up a reverse proxy
• Inclusion of BasicAuthenticator class for simple demo deployments
• Supports additional OAuth services using oauthenticator package

Updates:

• Updated Makefile with supported Ubuntu 18.0.4 and CentOS7 build
• Updated tornado package to version 5.1.1
• Updated dependency versions (now install astor through PyPi)
• Updated documentation

Removals

• Replace deprecated tornado.testing.LogTrapTestCase test case class with ExpectLog
• Remove AsyncTestCase patch for older versions of tornado.testing

Maintenance

• Docker compose scripts included to build SR docker image for debug purposes
• Included geckodriver installation for selenium testing
• TravisCI build now uses Ubuntu 18.04 and Firefox 75.0

[flongford]

Currently debugging unit tests for Container class - there seems to have been a change in expected behavior of the remoteappmanager.webapi.tests.test_container methods.

This may be coming from differences in the mock_coro_new_callable and mock_coro_factory functions in the remoteappmanager.tests.utils module

[codecov-commenter]

Codecov Report

Merging #544 into master will increase coverage by 0.08%.
The diff coverage is 95.38%.

@@            Coverage Diff             @@
##           master     #544      +/-   ##
==========================================
+ Coverage   95.18%   95.26%   +0.08%     
==========================================
  Files          85       86       +1     
  Lines        3905     4015     +110     
  Branches      247      252       +5     
==========================================
+ Hits         3717     3825     +108     
+ Misses        137      136       -1     
- Partials       51       54       +3     

Impacted Files	Coverage Δ
remoteappmanager/handlers/base_handler.py	96.66% <ø> (-0.11%)	⬇️
remoteappmanager/tests/utils.py	90.74% <ø> (+9.38%)	⬆️
remoteappmanager/webapi/tests/test_application.py	100.00% <ø> (ø)
remoteappmanager/webapi/container.py	82.83% <33.33%> (-0.75%)	⬇️
remoteappmanager/base_application.py	92.13% <54.54%> (-5.34%)	⬇️
...eappmanager/jupyterhub/auth/basic_authenticator.py	86.66% <86.66%> (ø)
remoteappmanager/cli/tests/test_remoteappdb.py	100.00% <100.00%> (ø)
remoteappmanager/command_line_config.py	100.00% <100.00%> (ø)
remoteappmanager/db/csv_db.py	98.76% <100.00%> (+0.01%)	⬆️
remoteappmanager/db/interfaces.py	100.00% <100.00%> (ø)
... and 34 more

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